JPH10106154A - Optical disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the increase of the access speed and to attain the miniaturization of a motor by deciding the number of rotation of a disk at the time of reproduction with a detected value of the information recorded area prior to the information reproduction. SOLUTION: The information recorded area on the optical disk 1 is detected by an area detector 9. The number of rotation of the disk 1 at the time of reproduction is decided by a system controller 10 in accordance with the detected value of the information recorded area of the circuit 9 prior to the information reproduction. This number of rotation is decided so that an information reproduction rate of the information recorded area at the outermost periphery becomes a specified value, e.g. the maximum reproducing rate processable by a decoder 8. By the controller 10, the decided number of rotation is set in a rotation control circuit 6 as a target value at the time of information reproduction, and the number of rotation is settled to a constant value during the reproduction independently of the radius of a reproducing track.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive, and more particularly, to a disk rotation control device during reproduction of an optical disk of a constant linear density system and an area setting device during recording.

[0002]

2. Description of the Related Art Generally, an optical disk, a so-called compact disk (CD), is a digital disk.
Spiral tracks are formed on the disk at a constant linear density from the inner circumference to the outer circumference. As a method of playing such a disk, the linear velocity of the disk is kept constant,
CLV method (C
Instant Linear Velocity) is known. As another reproduction method, the (M) CAV method [(Mo) in which the information reproduction rate changes in the radial direction of the disk while keeping the rotation speed of the disk substantially constant.
modified) Constant Angular
Velocity] (hereinafter referred to as MCAV system) is known (JP-A-2-183469, JP-A-2-2469).
No. -126472).

In the MCAV system, the change in the number of rotations of the disk due to the access radius can be reduced, so that the access time can be shortened and the motor for rotating the disk can be downsized. In addition, a CD on which information can be additionally recorded is also known. In this case as well, information is recorded on a track formed in a spiral shape from the inner circumference to the outer circumference so as to have a constant linear density. A write-once CD allows access to data already recorded on a disc even before the end of recording all information (Japanese Patent Publication No. 7-5).
No. 6746). Here, the relationship between the track radius on the disk and the data transfer rate during reproduction in the MCAV method will be described.

FIG. 12 is a diagram showing a relationship between a track radius on a disk and a data transfer rate during reproduction in the MCAV system. In the figure, the horizontal axis represents the track radius r, and the vertical axis represents the information reproduction rate f.

[0005] As shown in FIG.
In D, when the motor speed is constant, the data transfer rate f is proportional to the track radius r. FIG. 12 shows a recorded area and an unrecorded area of information when a part of information is recorded in a conventional information recordable CD. In the recorded area, the track is formed in a spiral shape from the inner circumference to the outer circumference, so that the head area is formed from the inner circumference side of the track. As a result, access to already recorded data may be performed even before the recording of all information is completed, so that the frequency of access to the inner peripheral area generally increases.

[0006]

In the MCAV system, since the data transfer rate is lower in the inner circumference, the data transfer rate is lower in the inner circumference area where the frequency of access is high in the information-writable CD using the MCAV system. Problem. An object of the present invention is to improve a data transfer rate during reproduction in the MCAV system.

[0007]

According to the first aspect of the present invention, there is provided an optical disk drive for reproducing information on an optical disk having spiral tracks having a substantially constant linear density from the inner circumference to the outer circumference. In an optical disk drive device including a reproducing unit that irradiates a track with a light beam to reproduce information and a rotating unit that rotates an optical disk, an area detecting unit that detects an information-recorded area of a track on the optical disk; Further, there is provided a reproduction control means for previously obtaining a disk rotation speed at which the information reproduction rate at the outermost periphery of the information recorded area becomes a predetermined value, and setting the disk rotation speed at the obtained constant rotation speed at the time of information reproduction.

According to a second aspect of the present invention, there is provided an optical disk drive for recording / reproducing information on a recordable optical disk on which a spiral track having a substantially constant linear density is formed from the inner circumference to the outer circumference. A recording / reproducing means for irradiating a light beam to record / reproduce information;
In an optical disk drive device provided with a rotating means for rotating an optical disk, at the time of information recording, recording control means for recording information from an outer peripheral area of the information recordable area, and at the time of information reproduction, the disk rotation speed is substantially reduced. Reproduction control means for reproducing information in the information recorded area at a constant speed.

According to a third aspect of the present invention, in the optical disk drive of the second aspect, the recording control means secures a recording-scheduled area from an outer peripheral area of the information recordable area in accordance with the amount of recorded information, Control is performed such that information is recorded from the beginning of the recording scheduled area.

According to a fourth aspect of the present invention, in the optical disk drive of the second aspect, there is provided recording information inverting means for inverting the order of the recording information sequence, and the recording control means rotates the optical disk in the reverse direction at the time of information recording. Control is performed to record the recording information sequence in the reverse order from the rear end of the possible area.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an optical disk drive of the present invention will be described in detail with reference to the drawings. First Embodiment This first embodiment corresponds to the first aspect of the present invention. In the first embodiment, an area detecting means for detecting an information-recorded area of a track on an optical disc, and a disc rotation speed at which an information reproduction rate at the outermost periphery of the information-recorded area becomes a predetermined value. By providing a reproduction control means which is determined in advance and sets the disk rotation speed to the determined constant rotation speed at the time of information reproduction, the disk rotation speed at the time of reproduction is determined based on the detected value of the information recorded area prior to the information reproduction. Is determined.

FIG. 1 is a functional block diagram showing an example of an embodiment of a main part configuration of an optical disk drive of the present invention. In the figure, 1 is an optical disk, 2 is an optical pickup, 2a is a seek motor, 3 is a spindle motor, 4 is a focus / tracking servo circuit, 5 is a seek control circuit, 6 is a rotation control circuit, 7 is an encoder,
Reference numeral 8 denotes a decoder, 9 denotes an area detection circuit, and 10 denotes a system controller.

First, the general configuration and operation will be described.
As described above, the so-called CD optical disc 1 includes:
A spiral track is formed from the inner circumference to the outer circumference. The optical pickup 2 irradiates a laser beam onto the track to record and reproduce information.
The focus / tracking servo circuit 4 controls an actuator in the optical pickup 2 to perform focus / tracking servo of a laser beam. The seek control circuit 5 controls the seek motor 2a to move the optical pickup 2 in the radial direction of the optical disc 1, and performs an access operation to a track on which information is recorded / reproduced. The rotation control circuit 6 controls the spindle motor 3 to rotate the optical disc 1 at a predetermined rotation speed. The decoder 8
The signal reproduced from the optical pickup 2 is decoded and reproduced data is output.

In the first embodiment, the area detection circuit 9 shown in FIG. 1 detects an information-recorded area on the optical disk 1. Currently, CDs include read-only CDs and write-once CDs.
And exists. In a read-only CD, a list of recorded data (TOC: Table of Contents)
Are recorded in a predetermined area on the inner circumference of the disk. Therefore, in a read-only CD, by reproducing the TOC information and holding the TOC information in the area detection circuit 9, the information-recorded area can be easily detected.

FIG. 2 is a diagram showing an example of the arrangement of the TOC and the recorded information in the radial direction of the disk for a read-only CD.

As shown in FIG. 2, the recording information is recorded from the inner circumference to the outer circumference of the disk. Then, TOC information is recorded at the head (inner side in FIG. 2). In a recordable CD, every time information is added, the TOC for each piece of additional information is set to PMA (Pr
The information is recorded in a predetermined area called an “program memory area”. The additional information is sequentially added to the recordable area excluding the TOC and the PMA from the inner peripheral side toward the outer peripheral side. When the recording of all information is completed, the TOC for each piece of additional information recorded in the PMA area is reproduced and integrated, and
Record C. Therefore, at this stage, additional writeable C
D is equivalent to the format of a read-only CD.

FIG. 3 is a diagram showing an example of an arrangement of PMA, TOC, and recorded information in the disk radial direction at each stage when information recording is performed three times on a recordable CD. ) Indicates an unrecorded disk, (2) to (4) indicate information 1
The state after information 3 is recorded, and (5) shows the state after all information is recorded.

As shown in FIG. 3A, when no additional recordable CD is recorded, nothing is recorded in the PMA area. Here, as shown in FIG. 3 (2), when information 1 is recorded, TOC1 is recorded in the PMA area. Next, FIG.
When the information 2 is recorded as in (3), TOC2 is additionally written in the PMA area. Further, as shown in FIG. 3 (4), when information 3 is recorded, TOC3 is additionally recorded in the PMA area. When recording of all information is completed in this state, as shown in FIG. ~ TOC3 is integrated, TOC
Is recorded. The recording state of the recordable CD shown in FIG. 3 (5) is equivalent to the format of the reproduction-only CD shown in FIG.

Therefore, even in this recordable CD, the PMA or TOC information is reproduced and the area detection circuit 9
, Like the previous playback-only CD,
The information recorded area can be easily detected.

Prior to information reproduction, the system controller 10 of FIG. 1 determines the disk rotation speed during reproduction based on the detected value of the information recorded area. The disc rotation speed is determined so that the information reproduction rate at the outermost periphery of the information recorded area becomes a predetermined value, for example, the maximum reproduction rate that the decoder 8 can process. Here, assuming that a predetermined information reproduction rate is F (bits / second), a linear density of information recorded on the disk is B (bits / mm), and an outermost radius of the information recorded area is R (mm). , The desired rotation speed N (rotation /
Seconds)

N = F / (2πRB)

The system controller 10 sets the obtained N as a target rotation speed to the rotation control circuit 6 during information reproduction. The rotation control circuit 6 sets the disk rotation speed to a constant value N during information reproduction regardless of the radius of the reproduction track. In this case, the relationship between the reproduction track radius r (mm) (r ≦ R) in the information recorded area and the information reproduction rate f (bits / second) is as follows.

F = 2πrBN = (r / R) F As can be seen from (Equation 2), the information reproduction rate f is a value proportional to the reproduction track radius r.
At the outermost peripheral position (r = R) of the information recorded area, the predetermined information reproduction rate F is reached.

FIG. 4 is a diagram showing an example of the relationship between the track radius on the disk and the data transfer rate during reproduction in the first embodiment of the optical disk drive of the present invention. In the figure, the horizontal axis represents the track radius r, the vertical axis represents the information reproduction rate f, and (a) to (c) show the cases where the recorded area of the information has changed.

FIG. 4 shows a recorded area of the information when a part of the information is recorded. FIG. 4 shows a case where (a) is recorded in a part of the inner peripheral area and (c) shows the whole. (B) is the middle case. For example, (a)
The information reproduction rate indicated by is the reproduction rate when the recorded area is the area indicated by the arrow (a) and the outermost radius is Ra. The same applies to (b) and (c), where the longer the recorded area, the larger the outermost radius thereof (Ra <Rb <R
c). In any case, the information reproduction rate f
Is a predetermined information reproduction rate F at the outermost periphery R of the information recorded area. Therefore, as shown in FIG. 4A, even when information is recorded only on the inner peripheral portion,
A high information reproduction rate can be obtained.

As described above, in the optical disk drive according to the first embodiment, prior to information reproduction, the disk rotation speed during reproduction is determined based on the detected value of the information recorded area. I have. Therefore, the number of rotations of the disk is not changed by the access radius, the access can be made faster, and the size of the motor can be reduced.
Even when information is recorded only in a part of the inner circumference of the disk, the disk rotation speed is determined according to the recorded area amount so as to obtain the highest data transfer rate. High-speed data reproduction becomes possible as compared with the system.

Second Embodiment The second embodiment corresponds to the second aspect of the present invention, but also relates to the third and fourth aspects of the present invention. In the first embodiment described above, as shown in FIG. 2, the case where the recording information is recorded from the inner peripheral side to the outer peripheral side of the disc has been described. The second embodiment is characterized in that when information is additionally recorded on a recordable CD, information is recorded from the outer periphery of a recordable area (unrecorded area or overwritable area). Have.

The hardware configuration of the second embodiment is the same as that of FIG. Then, at the time of information reproduction, the rotation control circuit 6 irrespective of the detection value of the information recorded area,
The disk rotation speed is set to a predetermined value. Also, every time additional information is recorded, the TOC for each additional information is recorded in the PMA area. When the recording of all information is completed, PMA
The TOC for each piece of additional information recorded in the area is reproduced and integrated to record the TOC. At this stage, the recordable CD becomes equivalent to the format of the read-only CD.

FIG. 5 shows an example of the arrangement of PMA, TOC, and recorded information in the radial direction of the disc at each stage when the information recording is performed three times according to the second embodiment for a recordable CD. (1) shows an unrecorded disk, (2) to (4) show a state after information 1 to information 3 has been recorded, and (5) shows a state after all information has been recorded.

FIG. 5 corresponds to FIG. 3 described above.
Information 1 to information 3 are different in that they are recorded from the outer peripheral side in the disk radial direction. However, FIG. 5 (5) showing the state after all the information is recorded is the same as FIG. 3 (5), and at this stage, the format of the read-only CD of FIG. become.

FIG. 6 is a diagram showing an example of a relationship between a track radius on a disk and a data transfer rate during reproduction according to the second embodiment. The horizontal axis in the figure is the track radius r,
The vertical axis indicates the information reproduction rate f, and (a) to (c) show the cases where the recorded area of the information has changed.

FIG. 6 shows a recorded area of information when a part of information is recorded, similarly to FIG. In the second embodiment, recording is performed sequentially from the outer peripheral portion of the disk. Therefore, as shown in FIG. 6A, at first, a part of the outer peripheral region of the track radius becomes a recorded region of information. . Then, as shown in FIG. 3C, when recording is performed over the entire disc, it becomes equivalent to the disc such as the read-only CD shown in FIG. 3C or FIG. However, in the second embodiment, (a) and (b) of FIG.
As shown in (1), even when information is recorded only on a part of the outer peripheral side of the disk, recording is performed from the outer peripheral part, so that a high information reproduction rate can be obtained. That is, as in the optical disk drive according to the first embodiment, the disk rotation speed does not change with the access radius.
Access can be made faster, the motor can be downsized, and high-speed data reproduction is possible.

Third Embodiment This third embodiment corresponds to the invention of claim 3, but also relates to the invention of claim 2. The third embodiment is characterized in that, when recording information, the system controller 10 secures a recording-scheduled area on the outer periphery of the recordable area in accordance with the area detection value and the amount of information to be recorded. have. Also in the third embodiment, the hardware configuration is the same as that in FIG.

In the CD, the total recording time is used as the recording position information. The recording operation of the CD is specifically performed as follows. The system controller 10 of FIG.
Is obtained from the total recording time TA (n) of the information-recorded area obtained from the area detection circuit 9 and the recording time T (n + 1) of the information amount to be recorded from now on, from the following equation (3). As a result, information on the total recording start time TA (n + 1) is obtained.

## EQU3 ## TA (n + 1) = TA (n) + T (n + 1) From the total time TA (n + 1), TA (n)
The area up to -1 is defined as a recording scheduled area.

FIG. 7 is a diagram showing an example of an arrangement of a relationship between a recorded area and a scheduled recording area in the disk radial direction in the third embodiment.

When the recording area is determined, the system controller 10 issues an access instruction to the position TA (n + 1) to the seek control circuit 5, and upon completion of the access, enables the encoder 7. Then, from the inner circumference to the outer circumference of the recording scheduled area, [TA (n + 1) → T
A (n) -1] information is recorded.

FIG. 8 is a diagram schematically showing an example of the order of recording in the recording area in the radial direction of the disk in the third embodiment.

As shown in FIG. 8, the information to be additionally recorded is recorded in the radial direction of the disk from the inside of the area to be recorded to the outer circumference which is the already recorded area.

As described above, in the third embodiment, when recording information, the system controller 10
Secures a recording-scheduled area on the outer periphery of the recordable area according to the area detection value and the amount of information to be recorded. Therefore, similarly to the optical disk drive according to the second embodiment, even in the case of a disk having a spiral track extending from the inner circumference to the outer circumference, recording can be performed from the outer circumference of the disk. As a result, a high data transfer rate is obtained, and high-speed data reproduction becomes possible.

Fourth Embodiment The fourth embodiment corresponds to the invention of claim 4, but also relates to the invention of claim 2. The fourth embodiment is characterized in that, when recording information, the system controller 10 outputs a reversal instruction to the rotation control circuit 6 to reversely rotate the disk.

FIG. 9 is a functional block diagram showing an example of the fourth embodiment of the main part of the optical disk drive of the present invention. The reference numerals in the figure are the same as those in FIG.

In the optical disk drive shown in FIG.
A data string inverting circuit 11 for inverting the order of the recording signal output from the encoder 7 on the time axis is added to the apparatus shown in FIG.
Has been added.

FIG. 10 is a diagram showing an input example and an output example of the data string inverting circuit 11.

As shown in FIG. 10, the data string inverting circuit 11 inverts the data string order. That is, FIG.
Input data (recording information) 0, 1,
.., K−1, k, as shown below, k, k−
Rearrange as 1,..., 1, 0. The tracks on the disk have a spiral shape from the inner circumference to the outer circumference. Therefore, when the disk is rotated in the reverse direction, the tracks on the disk form a spiral from the outer circumference to the inner circumference. Further, the recording / reproducing position also changes in the direction in which the total time is reduced as the disk rotates.

In the fourth embodiment, after the disk is rotated in the reverse direction, the system controller 10 instructs the seek control circuit 5 to access the position TA (n) -1. Column inversion circuit 11
The recording operation of the recording information whose order has been reversed is started.

FIG. 11 is a diagram schematically showing an example of data recording at the time of reverse rotation of the disk according to the fourth embodiment.

As shown in FIG. 11, the recording operation is performed from the outer periphery [TA (n) -1] of the recordable area toward the inner periphery. Since the format on the disk after the recording is the same as that of the normal recording, the information can be reproduced by rotating the disk in the normal direction using the normal decoder 8. As described above, in the fourth embodiment, when recording information, the system controller 10 outputs an inversion instruction to the rotation control circuit 6 to rotate the disk in the reverse direction. Therefore, the second
Similarly to the optical disk drive according to the embodiment, even in the case of a disk having a spiral track extending from the inner circumference to the outer circumference, recording can be performed from the outer circumference of the disk. As a result, a high data transfer rate is obtained, and high-speed data reproduction becomes possible.

[0046]

According to the first aspect of the present invention, prior to information reproduction, the optical disk drive according to the first aspect of the present invention, based on the detected value of the information recorded area,
The number of rotations of the disk during reproduction is determined. Therefore, since the disk rotation speed does not change depending on the access radius, it is possible to speed up the access and to reduce the size of the motor. Even when information is recorded only in a part of the inner circumference of the disk, the disk rotation speed is determined so as to obtain the highest data transfer rate according to the recorded area amount. It is possible to reproduce data at a higher speed as compared with.

In the optical disk drive according to the second aspect, recording is performed sequentially from the outer peripheral portion of the disk. Therefore, similarly to the optical disk drive of the first aspect, the number of rotations of the disk does not change depending on the access radius, so that access is quick and the motor can be downsized. Further, even in the case of a disk having a spiral track extending from the inner circumference to the outer circumference, recording is performed from the outer circumference of the disk.
A high data transfer rate can be obtained, and high-speed data reproduction can be performed.

In the optical disk drive according to the third aspect, at the time of recording information, the system controller secures a recording-scheduled area on the outer peripheral portion of the recordable area according to the area detection value and the amount of information to be recorded. I have to. Therefore, the same effect as that of the optical disk drive of the second aspect can be obtained.

In the optical disk drive according to the fourth aspect, when recording information, the system controller outputs a reversal instruction to the rotation control circuit to rotate the disk in the reverse direction. Therefore, the same effect as that of the optical disk drive of the second aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an example of an embodiment of a main part configuration of an optical disk drive of the present invention.

FIG. 2 is a diagram showing an example of the arrangement of a TOC and recorded information in a disk radial direction for a read-only CD.

FIG. 3 shows the P in the radial direction of the disc at each stage when information recording is performed three times on a recordable CD.
It is a figure showing MA, TOC, and an example of arrangement of recorded information.

FIG. 4 shows an optical disk drive according to the present invention;
FIG. 13 is a diagram showing an example of a relationship between a track radius on a disc and a data transfer rate during reproduction according to the embodiment.

FIG. 5 is a diagram showing an example of an arrangement of PMA, TOC, and recorded information in a disk radial direction at each stage when information recording is performed three times according to the second embodiment for a recordable CD. It is.

FIG. 6 is a diagram illustrating an example of a relationship between a track radius on a disc and a data transfer rate during reproduction according to the second embodiment;

FIG. 7 is a diagram illustrating an example of an arrangement of a relationship between a recorded area and a scheduled recording area in a disk radial direction in a third embodiment.

FIG. 8 is a diagram schematically showing an example of a recording order in a recording scheduled area in a disk radial direction in a third embodiment.

FIG. 9 is a functional block diagram showing an example of a fourth embodiment of the main part configuration of the optical disk drive of the present invention.

FIG. 10 is a diagram showing an input example and an output example of the data string inversion circuit 11;

FIG. 11 is a diagram schematically illustrating an example of data recording during reverse rotation of a disk according to a fourth embodiment.

FIG. 12 is a diagram showing a relationship between a track radius on a disc and a data transfer rate during reproduction in the MCAV system.

[Explanation of symbols]

 Reference Signs List 1 optical disk 2 optical pickup 2a seek motor 3 spindle motor 4 focus / tracking servo circuit 5 seek control circuit 6 rotation control circuit 7 encoder 8 decoder 9 area detection circuit 10 system controller 11 data string inversion circuit

Claims (4)

[Claims] 1. An optical disk drive for reproducing information on an optical disk having spiral tracks with a substantially constant linear density formed from an inner circumference to an outer circumference, irradiating a track on the optical disk with a light beam, An optical disk drive device comprising: a reproducing unit for performing reproduction; and a rotating unit for rotating the optical disk, an area detecting unit for detecting an information-recorded area among tracks on the optical disk, and information at an outermost periphery of the information-recorded area. An optical disk drive device comprising: a reproduction control means for previously obtaining a disk rotation speed at which a reproduction rate becomes a predetermined value, and setting the disk rotation speed to the determined constant rotation speed during information reproduction. 2. An optical disk drive for recording / reproducing information on / from a recordable optical disk on which a spiral track having a substantially constant linear density is formed from an inner circumference to an outer circumference, wherein a light beam is applied to the track on the optical disk. In an optical disc driving apparatus including a recording / reproducing means for irradiating and recording / reproducing information and a rotating means for rotating an optical disc, at the time of information recording, information is recorded from an outer peripheral area of an information recordable area. An optical disk drive, comprising: a recording control means for performing information reproduction; and a reproduction control means for reproducing information in an information-recorded area at a substantially constant disk rotation speed during information reproduction. 3. The optical disk drive according to claim 2, wherein the recording control means secures a recording scheduled area from an outer peripheral area of the information recordable area in accordance with an amount of recording information, An optical disk drive device which controls to record information from the head. 4. The optical disk drive according to claim 2, further comprising: recording information inverting means for inverting the order of the recording information sequence, wherein the recording control means rotates the optical disk in the reverse direction during information recording, and controls the rear end of the information recordable area. An optical disk drive device for performing control for recording a recording information sequence in a reverse order from the above.